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Publication numberUS3697939 A
Publication typeGrant
Publication dateOct 10, 1972
Filing dateDec 28, 1970
Priority dateDec 28, 1970
Publication numberUS 3697939 A, US 3697939A, US-A-3697939, US3697939 A, US3697939A
InventorsAlbert W Musgrave
Original AssigneeMobil Oil Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Corrections for seismic data obtained from expanding-spread
US 3697939 A
Abstract
Seismic signals from detectors forming split spreads are utilized to correct for weathering, elevation, and the like signals from detectors forming an expanded spread. The signals of the seismic section delineated by the expanded spread have applied thereto time changes under the control of a hyperbolic generator. There are generated as a result of the sweeping across the section and lengthwise thereof of the seismic signals the generation of functions utilized to provide normal moveout corrections of greater precision or accuracy than heretofore. With the normal moveout corrections of greater accuracy applied to the signals of the seismic section, additional corrections are made for dip and thereafter for delineation of the velocity characteristics of the earth along the stratigraphic column. There is included provision not only for identification of primary reflections and multiples but also for the elimination of multiples from the signals of the seismic section. The foregoing operations are carried out in an automatic system which may be either of the analog or digital type.
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United States Patent Musgrave 1 CORRECTIONS FOR SEISMIC DATA OBTAINED FROM EXPANDING- SPREAD [72] Inventor: Albert W. Musgrave, Dallas, Tex.

[73] Assignee: Mobil Oil Corporation [22] Filed: Dec. 28, 1970 [21] Appl. No.: 101,776

Related US. Application Data [63] Continuation of Ser. No. 496,735, Sept. 30,

1965, abandoned, which is a continuation of Ser. No. 95,1 1 1, March 13, 1961, abandoned.

52 us. or ..340 1s.s TD, 340/155 R, 340/ 15.5 MC, 346/33 (3 51 1m. (:1. ..'.'...'....G0iv 1724 [58] Field of Search.340/l55 TD, 155 MC; 346/33 C OTHER PUBLICATIONS Seismic Velocities from Surface Measurements C.

[451 Oct. 10, 1972 Hewitt Dix, Geophysics, Vol. 20, No. 1, Jan. 1955 Complex Reflection Patterns and Their Geologic Sources Frank Rieber, Geophysics, vol. 2, No. 2,

Mar. 1937 Vertical Velocities and Reflection Shooting L. W. Gardiner, Geophysics, vol. 12, No. 2, Apr. 1947 Velocity Determinations by Means of Reflection Profiles C. H, Green, Geophysics vol. 3, No. 4, Oct. 1938 Primary ExamineF-Benjamin A. Borchelt Assistant Examiner-H. A. Birmiel Attorney-William J. Scherback, Frederick E. Dumoulin, Andrew L. Gaboriault and Sidney A. Johnson [57] ABSTRACT Seismic signals from detectors forming split spreads are utilized to correct for weathering, elevation,iand the like signals from detectors forming an expanded spread. The signals of the seismic section delineated by the expanded spread have applied thereto time changes under the control of a hyperbolic generator. There are generated as a result of the sweeping across the section and lengthwise thereof of the seismic signals the generation of functions utilized to provide normal moveout corrections of greater precision or accuracy than heretofore. With the normal moveout corrections of greater accuracy applied to the signals of the seismic section, additional corrections are made for dip and thereafter for delineation of the velocity characteristics of the earth along the stratigraphic column. There is included provision not only for identification of primary reflections and multiples but also for the elimination of multiples from the signals of the seismic section. The foregoing operations are carried out in an automatic system which may be either of the analog or digital type.

48 Claims, 31 Drawing Figures PATENTEDum 10 I972 SHEET 03 [IF 18 Fig. 5

Fig. 2

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PATENTED T I972 3.697.939 SHEET as [1F 18 PM'IENTED II 3,697,939 sum USUF 18 SQUELCH F79. 6

ClRCUlTS PICK-UP RECORD HEADS HEADS e 5-4-3-2 0+1 +2 6 -s 4 32 1 0H +2 RECORD HEADS PATENTEU 10 I973 3,697,939 SHEET 11m 18 n TT T T T uoa{ I I0 NORMAL MOVEOUT CORRECTION Display MECHZNTCZFL BER EETRJN F0 EQNTKC? PATENTFEDIJCT 10 m2 3.697, 939 SHEET lZUF 18 SEISMIC RECORD Fig. 8 sse 252\(I l l 0 J REDUCTION gLl GEARING IEFILII:

PATENTED 10 I972 3.697.939 SHEET 13 0F 18 Fig. 1/

I 1 I CORRECTED FOR DIP WITH EQUATION Vq To 270\\ I+K vq l I where K=dipl unit distance BY VALUES FROM DIP DETERMINATION DEVICE,(FIGS. l3-l4) V 7: AT(2T+AT) PATENTED 10 3.697, 939 SHEET 1n [1F 18 DIP PLAY-BACK f SCANNING DEVICE 1 DEVICE SEISMIC 50e, 50d 50c: 50b 50a, RECORD 287 RECORDER CORDER From IIO T (Squared Scale) X (Squared Scale) PATENTEDUIII 10 I972 BAC ECO HE S

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2087120 *Jun 15, 1936Jul 13, 1937Western Geophysical CompanyMethod of making weathering corrections in seismic surveying
US2555806 *Mar 18, 1947Jun 5, 1951Texaco Development CorpSeismic prospecting method, including generation of a cylindrical wave front
US2988729 *Mar 1, 1957Jun 13, 1961Socony Mobil Oil Co IncProduction of seismic record sections
US3075172 *Jun 5, 1957Jan 22, 1963Socony Mobil Oil Co IncNormal moveout correction
US3105568 *Dec 7, 1959Oct 1, 1963Jersey Prod Res CoSeismic profiling system
US3156892 *Feb 2, 1959Nov 10, 1964Atlantic Refining CoStoring and reproducing coordinate functions on ferromagnetic material for use in correcting seismic records
US3223967 *Nov 23, 1962Dec 14, 1965Pan American Petroleum CorpEliminating seismic interference waves by a cancellation procedure
Non-Patent Citations
Reference
1 *Complex Reflection Patterns and Their Geologic Sources , Frank Rieber, Geophysics, vol. 2, No. 2, Mar. 1937
2 *Seismic Velocities from Surface Measurements , C. Hewitt Dix, Geophysics, Vol. 20, No. 1, Jan. 1955
3 *Velocity Determinations by Means of Reflection Profiles , C. H. Green, Geophysics vol. 3, No. 4, Oct. 1938
4 *Vertical Velocities and Reflection Shooting , L. W. Gardiner, Geophysics, vol. 12, No. 2, Apr. 1947
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3794827 *Jan 8, 1973Feb 26, 1974Amoco Prod CoInvel system of velocity determination
US4188611 *Jan 9, 1978Feb 12, 1980United Geophysical CorporationSeismic prospecting system
US4201972 *Oct 28, 1977May 6, 1980United Geophysical CorporationSeismic prospecting system
US4202048 *Nov 11, 1976May 6, 1980United Geophysical CorporationSeismic prospecting system
US4467460 *Feb 26, 1981Aug 21, 1984The Standard Oil CompanySeismic data acquisition method
US5150331 *Mar 25, 1991Sep 22, 1992Amoco CorporationMethod for enhancing seismic data
Classifications
U.S. Classification367/54, 367/51, 346/33.00C
International ClassificationG01V1/36
Cooperative ClassificationG01V1/362
European ClassificationG01V1/36B